Docs: convert some component config to zuul directives
This updates common and scheduler.
Also adds a note to the docs style guide about booleans because
I was reminded of it while I was updating this.
Change-Id: I56b3e3c8f99548887056b881f9b3d77e9f45b275
diff --git a/doc/source/developer/docs.rst b/doc/source/developer/docs.rst
index cce4ca3..6a7256e 100644
--- a/doc/source/developer/docs.rst
+++ b/doc/source/developer/docs.rst
@@ -20,6 +20,11 @@
a specific string into a configuration file) should use the RST
````literal```` syntax.
+YAML supports boolean values expressed with or without an initial
+capital letter. In examples and documentation, use ``true`` and
+``false`` in lowercase type because the resulting YAML is easier for
+users to type and read.
+
Terminology
~~~~~~~~~~~